<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../vue.js"></script>
    <style>
        .div1 {
            width: 100px;
            height: 100px;
        }

        .div2 {
            background-color: aqua;
        }

        .div3 {
            background-color: aquamarine;
        }
    </style>
</head>

<body>
    <div class="wrap">
        <input type="text" :value=num>
        <div :class="'div'"></div>
    </div>
</body>
<script>

    new Vue({
        el: '.wrap',
        data: {
            num: 200123,
            'div': {
                'width': '200px',
                'height': '200px',
                'background-color': 'aqua'

            }
        }
    })

</script>

</html>